Two of several previous answers in the link.
Other compounds are argon (0.93%), carbon dioxide (0.039%) and water vapor. Oxygen and nitrogen make up most of dry air.
Air is mainly that mixture of oxygen and nitrogen (about 78 and 21 percent respectively), but also, in much smaller parts, are represented in the table below. Table is courtesy of the link provided, which in turn was provided by the CRC Handbook of Chemistry and Physics.
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